Coffee mug



FIG. 1 is a perspective view of the coffee mug showing my new design;

FIG. 2 is a front view thereof,

FIG. 3 is a right side view thereof, the left side view being a mirror image of the right side view;

FIG. 4 is a rear view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a sectional view thereof taken along line 7-7 of FIG. 5. 

CLAIM The ornamental design for a coffee mug, as shown and described. 